Improvement in pump-filters



JOHN GHRISTMAN, OF SYRAGUSE, NEW YORK.

IMPROVEMENT IN PUMP-FILTERS.

Specilication forming part of' Letters Patent N0. 51,145, dated November 28, 1865.

To all whom it may concern: i

Be it known that I, JOHN GHRISTMAN, of the city ot" Syracuse, New York, have invented a new and Improved Pump Filter; and Ido hereby declare that the following is a full, clear, and exact description ol' the construction of the same, and the forni thereofwhen complete, reference being,` had to the annexed drawing', making a part of this speciliation.

The letters used represent the same parts wherever they occur. y

To enable others skilled in the art to make and use my invention, will proceed to describe the construction of the filter, and its form when complete and ready for use.

I use any kind of common wire, and arrange sections thereof in a tubular form, A, so that the longitudinal sections a a a a, &c., will form an open grate. The ends of the wire sections designed for the lower part ot' the filter are Welded together in a compact form, which may be round, pointed, or square across. The ends of the wire sections designed for the upper part of the lter are made to pass between two shoulders, b the inner one, and c the outer one, forming a part of the round head-piece B, thus keeping them in a circular or tubular form, and to hold the same firmly the outer shoulder, c, may be soldered down upon the wire sections, and the saine thus held securely in their places. rIhe head-piece will be ofsnicient length so that the upper end thereof may receive the cut of a screw either on the inside or the outside, as may be desirable, as seen at d, to receivethe pump-tube D. Fitting' the inside of the wire tube thus formed I insert another tube, C, made ot' common wire-gauze, and the two thus formed make a strong and perfect filter to be used at the bottom of pumptubes.

The tube of wire-gauze may, in case there is quicksand, be packed with charcoal or other filtering substances; but for ordinary use no such packing' would be necessary.

That I claim as my invention, and desire to secure by Letters Patent, is-

A pump-filter composed of the parts A, B, Iund U, substantially as and for the purposes described.

JOHN GHRISTMAN.

Witnesses N. B. SMITH, P. CoRBErT. 

